Check for power to the switch but as this vehicle was sold without front fogs then check with the local vehicle inspection garage thats its ok to fit them as it may not be on the paperwork for the vehicle and it could fail the test ,well this is spain home of the paperwork wannabies
SOURCE: 1991 volvo tail lights
Could you take out a bulb and with a testlight/probe check that you do in fact have power to that circuit .Also check that they are the correct bulb for that application I have seen people put indicator bulbs in where therse supposed to be a double filament bulb.Does the base of the bulbs lead contacts line up with the two steel terminals inside the plug?
SOURCE: front fog lights not working
if the fuse on the driver side panel is good,and the relay under the dash is good then check your connections or your bulbs
SOURCE: Replace front left fog light bulb on 2000 Volvo
no, just remove under covers to gain acess to rear of lamp ,this is where you can replace the bulb no need to remove bumper, thats just crazy anyway hope this helps good luck.
SOURCE: brake light switch on 2001 volvo s40
Yes switch is the problem. Volvo claim they sell very few switches, probably because people bought new cars instead. Problem can be associated with failed ignition coils (2 of) but one does not cause the other but very confusing. Engine fails intermittently or conks out.
Reset battery earth connection on chassis bad design here. Clean off paint and thread also bolt coating. Even better, use brass bolt but do not overtighten. Volvo will try to get you to replace alternator which is not necessary.
Failing battery will light up all the warning lights but will not isolate the battery so if it shorts car will die and not run on alternator. If this happens disconnect battery until you get to garage.
Now you know you can buy an old S40 with confidence great car and very cheap for what you get.
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